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2) (z + 1)² = z² + 2z(1) + 1² = z² + 2z + 1
3) (x + 1/x)² = x² + 2(x)(1/x) + (1/X)² = x² + 2 + 1/x²
4) (y - 2)² = y² - 2(y)(2) + 2² = y² - 4y + 4
5) (1/x + 1/y)² = (1/x)² + 2(1/x)(1/y) + (1/y)² = 1/x² + 2/(xy) + 1/y²